Friday, April 2, 2010
Water Pollution and Our Environment.
Industrial wastes are other source of water pollution. The pollutants released depend mainly on the kind of industry. The impact of industrial discharges depends not only on their collective characteristics, such as biochemical oxygen demand and the amount of suspended solids, but also on their content of specific inorganic and organic substances. Water performs several industrial functions, serving as a raw material, heating and cooling various processes, and transporting. Although the majority of industrial wastes entering natural waters are not toxic or lethal to human beings, their increasing abundance has affected the ecological balance of many of the world’s waterways and lakes.
The second largest use of water is for irrigation in agriculture. The water that drains from irrigated lands is highly concentrated in dissolved soil solids and salts. This water carries toxic material such as contents of chemical fertilizers, pesticides and insecticide. Agriculture, including commercial livestock and poultry farming, is the source of many organic and inorganic pollutants in the surface waters and ground waters. Animal wastes are high in oxygen demanding material, nitrogen, and phosphorous, and they often build pathogenic organisms.
Polluted waters are murky, foul smelling, undrinkable, and often teeming with life. Nature’s own system of purification of water, aeration of running water and settling out of the particles it contains, has been overloaded by mans pollution. Effects of water pollution can even result in death. The relationship between water quality and health are more complicated and only a few water related problems have been evaluated so-far. Eutrophication is one of the major effects of water pollution. It is a natural state of many lakes and ponds with an abundant supply of nutrients and a high rate of formation of organic matters by photosynthesis. Eutrophication involves the gradual increase of plant life in a lake until it turns into a marsh, which fills with mud and dead plant debris and finally becomes solid land. When this happens, plants or animals living under the water will be deprived of oxygen and will die soon.
Earth contains 75 percent of water. But now only 20 percent of which is available to drink. If humans are wasting these precious drops, the whole animal kingdom has to suffer. The situation when animals are deprived of drinking water has actually started. What will be the next situation?
Posted by Kalesh